(died 1405). The family seat, Cahir Castle, is built on an island in the River Suir. Much of the barony of Iffa and Offa West was controlled by the Butler Barons Cahir. Notable family members Thomas Butler of Cahir (died 1476) Barons of the first creation Thomas Butler, 1st Baron Cahir (died 1558), son of Thomas Butler of Cahir. His brother Piers Butler would later supply future barons when his own line failed to produce any other male heirs upon the death of his own son. Edmund Butler, 2nd Baron Cahir (died 1560) Barons of the second creation Theobald Butler, 1st Baron Cahir (died 1596), son of Piers Butler and nephew of the 1st Baron. Thomas Butler, 2nd Baron Cahir (died 1627), son of the 1st Baron. Died without a male heir. Thomas Butler, 3rd Baron Cahir, son of Piers Butler, nephew of the 2nd Baron and grandson of the 1st Baron. Butlers of Polestown and Roscrea This branch also sprang from the 3rd Earl. Three distinct branches are associated with this branch of the family. The family tree splits firstly with Edmund MacRichard Butler; his eldest son, Sir James, founded the most illustrious sub-branch with his progeny going on to supply the 8th Earl of Ormond; his second son, Walter, founded the lesser sub-branch with his progeny going on to become baronets of Polestown. This sub-branch split thirdly to found a Roscrea branch in the barony of Ikerrin, County Tipperary, beginning with Walter's grandson. Note: "Polestown" is also spelled in the records as Poolestown". It is now identified with the town of Paulstown in Gowran, County Kilkenny. Notable family members Sir Richard Butler of Polestown (1395–1443) Walter Butler of Polestown (died 1483) Sir Richard Butler (Poletown) (died 1619) Edmond Butler of Polestown (died 1636) Peter Butler of Roscrea Walter Butler of Roscrea Butlers of Mountgarret, Cloughgrennan, Kilcash & Duiske The common ancestor here is Piers Butler, 8th Earl of Ormond. Three minor family branches sprang from his eldest son – James; Cloughgrenan, Kilcash and Duiske / Galmoye, His younger son, Richard Butler, founded the junior but long lasting Mountgarret line. Senior line - earls of Ormond, heirs of the 8th earl Mountgarret line - heirs of the second son of the 8th earl Cloughgrenan line - heirs of the second son of the 9th earl Kilcash and Thurles line - heirs of the third son of the 9th earl